During "Diplomatic Immunity," Erikur expresses affection for the Bosmeri waitress, Brelas, and stares at her throughout the party. If Brelas is spoken to, she comments on the fact. Erikur can be used as a distraction during the party, if the Dragonborn promises to have Brelas "meet" with him in his quarters later. Whether or not the Dragonborn does this, Erikur provides the distraction.

Gisli, another resident of Solitude, is his resentful sister. Gisli lives with him at their house.

Erikur is the client for this Thieves Guild quest. After being cheated by the captain of the Dainty Sload, Erikur contracts the Thieves Guild to frame him for possession of the illegal drug Balmora Blue.

Killing him prior to the quest will render it impossible to complete. By extension, the achievement "One with The Shadows" cannot be collected with him dead.

Killing Erikur causes hired thugs to come to a city that the Dragonborn is in shortly after, and the thugs drop a contract. The letter tells the Dragonborn that his sister, Gisli, paid the thugs. Entering Solitude after this opens special dialogue with Gisli. In some cases, the Dragonborn may receive a letter from Gisli saying, "We both know you killed him. Thank you for killing him, he will not be missed."

Killing him may also cause his housecarl Melaran to send a letter of thanks to the Dragonborn.

After killing Bryling, Erikur sends the Dragonborn a letter, saying "Thank you for killing her, she will not be missed".

Elisif: "Steward Falk, I have a task for you. I want to begin stockpiling food and water in the event we come under siege, and I would like you to oversee this work personally."Falk: "A wise course of action, my Jarl. However, we have little food or water to spare."Erikur: "General Tullius will never allow that. He's ordered all surplus food to be given over for the war effort."Falk: "General Tullius does not run this city, Thane Erikur. Or have you forgotten your oaths of fealty?"Erikur: "My apologies, Jarl Elisif. I was thinking only of the importance of the war effort."Elisif: "There's no need for an apology, and you're right about the war. Perhaps this is a matter best discussed with the general in person."Falk: "I will make the arrangements, my Jarl."

Erikur: "I've heard the Empire plans to levy a tax on our trading ships. Falk, you've got to do something about this."Falk: "General Tullius needs more money for the war effort. We need the funds to arm and provision more troops."Erikur: "Then let's increase the taxes on the farms and merchants. We can't afford to lose the loyalty of the ship captains."Falk: "We know full well about your investment in shipping ventures, Erikur. I've also heard troubling rumors about dealings between you and the crew of that pirate ship, the Red Wave. Thankfully, Jarl Elisif cares far less about your lost profits than she does about winning the war!"Erikur: "The Jarl would be wise to remember that it is her Thanes―and my profits―that are paying for this war."

Elisif: "As you know, Solitude's coffers are much depleted by the war efforts. Thane Erikur, you have a strong head for business. What do you suggest?"Erikur: "This is an unfortunate but unavoidable ebb in revenue. But as long as we continue to support the Empire, our sacrifices will be well rewarded."Bryling: "Listen to you, speaking of sacrifice. You've never gone hungry a day in your life, Erikur!"Elisif: "And what would my impetuous Thane Bryling suggest, instead?"Bryling: "Simple. Let the Empire fight its own war, with its own funds, and without hijacking our supplies and soldiers. Let Haafingar rebuild."Erikur: "My lady... Surely you're not that naïve. Such foolishness would only leave us defenseless. The rebels would storm the palace in an afternoon."Bryling: "The Stormcloaks only rebel because the Empire uses Skyrim as its personal larder. The more they take, the more support the rebels gain!Elisif: "That is quite enough. Perhaps I will raise these issues when I have an audience with General Tullius."

Elisif: "Thane Bryling, what do you have to report about the state of Haafingar's defenses?"Bryling: "The news is the same as it's been for the rest of the war, your grace. Our borders are secure, but at the cost of the guards for our towns and roads."Erikur: "I don't see any reason why we'd need them. As long as those dogs stay outside of our borders, we're fine."Bryling: "The Stormcloaks are far from the only threat to the hold. The roads are beset by bandits and beasts... and now there's even talk of bloody dragons."Erikur: "My dear Bryling. Barring any... fancy and folly... the good people of Haafingar are surely capable of dealing with the odd highwayman or stray dog."Bryling: "Trouble on the roads and cities means less commerce. Less commerce means less money and more starving people. And that means more crime."Erikur: "Humph. That's only a problem for people who can't afford to hire their own security.Elisif: "That may well be our only answer. I will empower my Steward to seek out capable individuals to secure Haafingar. Thank you, my Thanes."

Erikur: "Melaran, you lazy milk-drinker, have you finished studying the imports from Black Marsh?"Melaran: "Indeed I have, sir. Elven weapons for their armies, sir. Elven material, but poor workmanship, like most of what we get from them."Erikur: "Scary, thinking of those boots with an army of Elven weapons at their command. Let's be thankful they're half a world away, eh?"Melaran: "Even a fine weapon is only as good as its wielder, sir. But they should fetch a high price from the Imperial army."Erikur: "Right you are, elf! Or even from the rebels, if they've got enough money to make a competitive offer."Melaran: "As always, lord, your loyalty is a shining example to us all."

Erikur: "Sister, how is my fortune coming along?"Gisli: "Profits continue to rise. The warehouse continues to bring in good revenues, and rent on your stores in the Well is acceptable."Erikur: "I'm afraid 'acceptable' just isn't acceptable anymore. I'm sure they can spare a few more coins in monthly rent."Gisli: "Yes, brother. I'm sure they'll agree it's a fair price to pay in order to avoid interacting with you on a daily basis."Erikur: "Fair or not, they'll pay it, and that's all I need to care about. Bear that in mind, sister."

Erikur: "That clumsy maid at the palace spilled wine on my best suit. Sister, I believe it's time for a replacement."Gisli: "I can commission one from the Radiant Raiment. It won't be cheap, but if you want the best, they're the only choice."Erikur: "I swear, those scheming elves charge us twice what anyone else would pay."Gisli: "Of course they do, brother. You keep raising their rent."

Sond and Briehl, along with generic bandits, have facial features that resemble Erikur.

Erikur admits to having a weakness for Bosmer women, but he does not make any comments if the Dragonborn is a female Bosmer.

He may be found speaking with Melaran about elven weapons that he wants to sell. He mentions that he could sell them to the Stormcloaks, meaning that he is not as devoted to the Empire as he says, although it may be the contrary, given than elven weapons, being Altmer-manufactured, are often viewed with disdain by the Stormcloaks.